共查询到18条相似文献,搜索用时 140 毫秒
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聚丙烯酸酯无皂水溶胶阻尼涂料动态力学性能的研究 总被引:6,自引:0,他引:6
用分步溶液聚合法合成了两种丙烯酸酯共聚物的共混物[P(BA-HEMA-AA)/P(MMA-HEMA-AA)A],制成无皂水溶胶,加入交联剂配成涂料。两种共聚物既可相互贯穿缠结,又可通过交联剂交联,使涂膜同时具有物理交联和化学交联。用动态力学分析法(DMA)、扭辫分析法(TBA)考察了涂膜的动态力学性能,表明涂膜具有IPN结构,并有良好的阻尼性能。 相似文献
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钼酸铵热分解过程动力学研究 总被引:3,自引:0,他引:3
有关多相钥酸钦在加热过程中的热分解行为,我们已用热重、差热及高温X一射线衍射等测试方法进行了系统研究以.如物相!fi.rsro为例4.50%(质量分数,下同)(NH4kM070。。·4H。0+44.85%(NH小M05017+50.65%((NH4)2M04013十几(NH4)2M04013)的用酸按混合物消记 相似文献
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锆螯合物交联丙烯酸酯共聚物无皂水溶胶的研究Ⅱ锆螯合物与丙烯酸酯三元共聚物无皂水溶胶的交联反应 总被引:1,自引:0,他引:1
研究了三元丙炮酸酯共聚物(MMA/BA/AA)无皂水溶液中加入三乙醇胺锆螯合物对水溶胶及涂膜性能的影响,在水溶胶中,螯合物增加了共聚物的亲水性,改变了水溶胶的流变性、稳定性、表面张力、螯合物也提高了共聚物涂膜的耐水性,X光电子能谱(XPS)研究表明,在固化成膜过程中螯合物与共聚物发生交联反应,用IR、^1HNMR、DSC、TGA和UV等方法对其交联机理作了初步探讨。 相似文献
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含铜三元类水滑石化合物的合成及其性质 总被引:11,自引:0,他引:11
以Cu(NO3)2,Zn(NO3)2和Al(NO3)3为原料,以NaOH为沉淀剂,利用共沉淀法合成了含铜三元类水滑石化合物CuZnAl-HTLcs.从不同Cu/Zn/Al比的混合原料溶液的滴定曲线入手,详细探讨了溶液pH值、原料加入方式、组分配比及水热处理条件对类水滑石合成的影响,利用XRD,ICP及比表面积测定对合成物进行了表征,并以苯酚羟基化为探针反应评价了催化剂的催化性能.结果表明,在体系pH=5.0~6.2,(Cu+Zn)/Al摩尔比=2.0,Cu/Zn摩尔比≤1.0及室温条件下共沉淀后,于100℃水热处理3h,即可得到晶相单一和结晶度高的CuZnAl-HTLcs.变化pH法合成的样品的相对结晶度为100%,低过饱和法为76.5%,高过饱和法为75.9%.合成的CuZnAl-HTLcs中Cu2+的含量均比原料液中Cu2+的含量有所增加,这可能是由于在pH=5.8时Cu2+对Al(OH)3的同晶取代能力比Zn2+强.随着CuZnAl-HTLcs中Cu含量的增加,催化剂对苯酚羟化反应的催化活性逐渐增大. 相似文献
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Harald Hofmeier Abdelkrim El‐Ghayoury Ulrich S. Schubert 《Journal of polymer science. Part A, Polymer chemistry》2004,42(16):4028-4035
Terpolymers bearing terpyridine as well as (meth)acrylates as free radical curable groups (UV‐curing) or hydroxyl groups (thermal curing with bis‐isocyanates) were synthesized and characterized using 1H NMR, IR and UV‐vis spectroscopy as well as GPC. Subsequently, the ability of covalent crosslinking via the UV‐initiated polymerization of the acrylate groups was investigated. Moreover, the thermal covalent crosslinking via the reaction of hydroxyl functionalized terpolymer and bis‐isocyanate compounds could be successfully achieved. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 4028–4035, 2004 相似文献
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A kind of aziridine crosslinkers was synthesized and used to crosslink acrylate copolymers. The crosslinkingproperties and curing kinetics of the resin were studied. It was found that with the increase of the content of crosslinker in theemulsion, the mechanical properties and solvent resistance of the resin will be apparently improved, but its glass transitiontemperature (T_g) is very low. The lowest amount of crosslinker used in the acrylic resin emulsion is 0.25%. Curing kineticsstudied by DSC show that this curing reaction occurs readily because the apparent activation energy of the reaction is low(65.1 kJ/mol). These results demonstrate that the aziridine crosslinker is indeed a low temperature crosslinking agent and canbe used at room temperature. 相似文献
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R. N. Santra T. K. Chaki P. G. Mukunda G. B. Nando 《Journal of Thermal Analysis and Calorimetry》1995,44(6):1401-1415
Curing reactions of ethylene methyl acrylate (EMA) polydimethyl siloxane (PDMS) rubber blends have been investigated by differential
scanning calorimetry (DSC) and by Rheometry. The curing exoterms obtained from DSC curves have been analysed to derive the
kinetic parameters associated with the curing process. Crosslinking of EMA-PDMS rubber blends follow first order kinetics.
The effect of blend ratio and peroxide concentration on the crosslinking characteristics of the blends have also been investigated.
Department of Metallurgical Engineering 相似文献
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SYNTHESIS OF SOAP-FREE ACRYLIC HYDROSOLS 总被引:2,自引:0,他引:2
Li Jia Zong-hui Liu De-qing Wei Chengd Institute of Organic Chemistry Chinese Academy of Sciences Chengdu China 《高分子科学》2002,(6):531-536
Poly(methyl methacrylate/ethyl acrylate/acrylic acid) hydrosols were prepared by employing soap-freepolymerization, and (acrylic acid/butyl acrylate) oligomer was used as the polymeric surfactant The effect of reactioncondition on the morphology and particle size of the hydrosols was investigated. The minimum amount of acrylic acid in thehydrosols is 2%. The maximum weight average molecular weight (M_w) of polymer that assures soap-free emulsionconversion into hydrosol is about 1.2×10~5-1.3×10~5. The particle transforming process was investigated, and an obviouschange of particle diameter and morphology was observed. 相似文献
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Nafion membranes were modified by chemical polymerization of aniline using ammonium peroxodisulfate as the oxidant. The Nafion-polyaniline composite membranes were extensively characterized using scanning electron microscopy (SEM), atomic force microscopy (AFM), infrared (FTIR-ATR) and X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and ion-exchange capacity measurements. The transport properties were also evaluated by conductivity and electrodialysis measurements. The data show that when a high oxidant concentration (1 M (NH4)2S2O8) is used, polyaniline is mostly formed at the surface of the Nafion membrane with a higher proportion of oligomers. On the contrary, when 0.1 M oxidant is used, polyaniline is mostly formed inside the ionic domains of Nafion, blocking the pathway to ion transport and thus reducing the transport of Zn2+ as well as the transport of H+. These data were also compared to the data obtained with poly(styrene sulfonate)-PANI composite membranes. 相似文献
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六甲氧基甲基三聚氰胺-多元醇-丙烯酸酯混杂聚合体系的研究 总被引:3,自引:0,他引:3
六甲氧基甲基三聚氰胺 (HMMM) 多元醇 丙烯酸酯 酸催化剂混杂聚合体系在高温下同时进行缩聚和自由基聚合并表现出协同效应 .体系中的活泼亚甲基在HMMM的催化下被空气氧化成过氧化氢物 ;过氧化氢物在酸催化下分解成自由基进而引发自由基聚合反应 .研究结果表明 ,体系中存在固化加速的协同效应 ;同时体系中还存在热互补效应 ,丙烯酸酯的自由基聚合反应放出的热可以传递给缩聚反应 ,满足缩聚反应吸热的要求 .混杂聚合得到的高分子合金膜具有优良的机械性能和耐溶剂性能 ,这是由于在混杂聚合过程中形成了互穿聚合物网络 (IPN)结构 .使用潜酸催化剂作为酸的来源 ,可以提高体系的储存稳定性 ;交联 引发剂的使用可以拓宽它的使用范围 ;对超枝化聚合物在混杂体系中的应用也进行了初步研究 相似文献